Co-ordinate Geometry MEI C1 Help

Announcements Posted on
    • Thread Starter
    Offline

    0
    ReputationRep:
    A(2,-1) and B(4,3) are two points on a circle with centre (1,2). What is the distance of the chord from the centre of the circle?
    A step to step solution thanks
    Online

    3
    ReputationRep:
    (Original post by davies4phones)
    A(2,-1) and B(4,3) are two points on a circle with centre (1,2). What is the distance of the chord from the centre of the circle?
    A step to step solution thanks
    We don't give step-by-step solutions here. Have a go first, show us what you've done and where you're going wrong, then we'll be able to guide you in the right direction.

    As for a place to start, sketch a small diagram of the circle, chord and the centre. I assume it wants the shortest distance from the chord to the centre which would mean you need to find a point on the chord (A) which makes OA perpendicular to the chord, then find the distance of this line.
    Offline

    1
    ReputationRep:
    you need to find the midpoint of the chord then using the equation ( which is probably in your book) you can find the distance between the two points
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by RDKGames)
    We don't give step-by-step solutions here. Have a go first, show us what you've done and where you're going wrong, then we'll be able to guide you in the right direction.

    As for a place to start, sketch a small diagram of the circle, chord and the centre. I assume it wants the shortest distance from the chord to the centre which would mean you need to find a point on the chord (A) which makes OA perpendicular to the chord, then find the distance of this line.
    So the midpoint of the chord is (3,1)
    so then do I need to find out the distance between (1,2) and (3,1) using the distance formula involving pythag
    Online

    3
    ReputationRep:
    (Original post by davies4phones)
    So the midpoint of the chord is (3,1)
    so then do I need to find out the distance between (1,2) and (3,1) using the distance formula involving pythag
    That's right.
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by CrystalSalvatore)
    you need to find the midpoint of the chord then using the equation ( which is probably in your book) you can find the distance between the two points
    Thank you
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by RDKGames)
    That's right.
    Thank you!
 
 
 
Write a reply… Reply
Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. Oops, you need to agree to our Ts&Cs to register
  2. Slide to join now Processing…

Updated: October 13, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Poll
How are you feeling about doing A-levels?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read here first

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.